The bass guitar, electric bass or simply bass, is the lowest-pitched member of the guitar family. It is a plucked string instrument similar in appearance and construction to an electric or acoustic guitar, but with a longer neck and scale length, and typically four to six strings or courses. Since the mid-1950s, the bass guitar has largely replaced the double bass in popular music.

Clarence Leonidas Fender was an American inventor known for founding the Fender Musical Instruments Corporation and designing the company's early models, the Fender Telecaster, Fender Precision Bass, and Fender Stratocaster. In January 1965, he sold Fender to CBS, and later founded two other musical instrument companies, Music Man and G&L Musical Instruments.

The acoustic bass guitar is a bass instrument with a hollow wooden body similar to, though usually larger than, a steel-string acoustic guitar. Like the traditional electric bass guitar and the double bass, the acoustic bass guitar commonly has four strings, which are normally tuned E-A-D-G, an octave below the lowest four strings of the 6-string guitar, which is the same tuning pitch as on an electric bass guitar.

The Fender Stratocaster, colloquially known as the Strat, is a model of electric guitar designed between 1952 and 1954 by Leo Fender, Bill Carson, George Fullerton, and Freddie Tavares. The Fender Musical Instruments Corporation has continuously manufactured the Stratocaster since 1954. It is a double-cutaway guitar, with an extended top "horn" shape for balance. Along with the Gibson Les Paul, Gibson SG, and Fender Telecaster, it is one of the most-often emulated electric guitar shapes. "Stratocaster" and "Strat" are trademark terms belonging to Fender. Guitars that duplicate the Stratocaster by other manufacturers are sometimes called S-Type or ST-type guitars.

The seven-string guitar adds one additional string to the more common six-string guitar, commonly used to extend the bass range or also to extend the treble range.

G&L is an American guitar manufacturing company founded by Leo Fender, George Fullerton, and Dale Hyatt in the late 1970s. G&L produces electric guitars and basses with designs based on some classic Fender instruments. The company also produces effects units. G&L's most notable player is Jerry Cantrell, vocalist and guitarist of Alice in Chains, having played several models of the guitar since the '80s, Cantrell also has his own signature Tribute Series Rampage and Superhawk. Cantrell can be seen playing a single-humbucker G&L Rampage in the music video for Alice in Chains' "Man In The Box".

The baritone guitar is a guitar with a longer scale length, typically a larger body, and heavier internal bracing, so it can be tuned to a lower pitch. Gretsch, Fender, Gibson, Ibanez, ESP Guitars, PRS Guitars, Music Man, Danelectro, Schecter, Jerry Jones Guitars, Burns London and many other companies have produced electric baritone guitars since the 1960s, although always in small numbers due to low popularity. Tacoma, Santa Cruz, Taylor, Martin, Alvarez Guitars and others have made acoustic baritone guitars.

The tenor guitar or four-string guitar is a slightly smaller, four-string relative of the steel-string acoustic guitar or electric guitar. The instrument was initially developed in its acoustic form by Gibson and C.F. Martin so that players of the four-string tenor banjo could double on guitar.

A B-Bender is a guitar accessory that enables a player to fluidly alter the pitch of a guitar's B-string. This works by mechanically bending the B-string through the use of a series of levers and/or pulleys attached to an external lever that is controlled by the player.

The Fender Bassman is a series of bass amplifiers introduced by Fender during 1952. Initially intended to amplify bass guitars, musicians used the 5B6 Bassman to amplify other instruments, including electric guitars, harmonicas, and pedal steel guitars. Besides being a popular and important amplifier in its own right, the Bassman also became the foundation on which Marshall and other companies built their high-gain tube amplifiers.

George William Fullerton was a longtime associate of Leo Fender and, along with Fender and Dale Hyatt, a co-founder of G&L Musical Instruments. He is credited with design contributions that led to the manufacture of the first mass-produced solid-body electric guitar.